Professional quality tools are not inexpensive, but they stand up and are fully guaranteed if they do fail. A friend of mine is an aircraft engine technician. He has had tools that did not meet his very high standards and he has found creative ways to break tools that did not meet his needs. The Snap on representative who goes to his shop always replaces his broken tool without any question other than to try to find out how he managed to break it
Try to find out about specific tools he needs, a bunch of sockets or spanners he already has are not going to be useful